Modeling of the rheological behavior of polyethylene/supercritical CO2 solutions

Abstract : This paper deals with the modeling of the rheological behavior of polyethylene (PE)/supercritical CO 2 solutions. Melt viscosity measurements were performed using a capillary tube die attached to a twin screw extruder, for different amounts of CO 2 injected into the extruder barrel (from 0 to 4 wt%). The viscosity of the solutions was determined by measuring the pressure drop and the polymer flow rate through the die. A D-optimal experimental design was developed to determine the minimal number of experiments necessary with a minimization of the error on the model coefficients. The experimental results showed that the viscosity of PE/CO 2 solutions depends on shear rate, temperature, pressure, and CO 2 concentration. The pressure in the capillary was modeled by a second order polynomial. A theoretical model based on a power law was proposed to describe the pseudoplastic behavior of PE/CO 2 solutions with different shear rates. Correction factors were included to take into account the effects of temperature, pressure, and CO 2 concentration.
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Chemical Engineering Science, Elsevier, 2006, 61 (16), pp.5334 - 5345. 〈10.1016/j.ces.2006.03.052〉
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https://hal.univ-lorraine.fr/hal-01629327
Contributeur : Sandrine Hoppe <>
Soumis le : lundi 6 novembre 2017 - 12:24:21
Dernière modification le : jeudi 11 janvier 2018 - 06:14:45

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Sandrine Hoppe, M. Nobelen, C. Fonteix, Fernand Pla, M. Dupire, et al.. Modeling of the rheological behavior of polyethylene/supercritical CO2 solutions. Chemical Engineering Science, Elsevier, 2006, 61 (16), pp.5334 - 5345. 〈10.1016/j.ces.2006.03.052〉. 〈hal-01629327〉

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